Flattened Organ Display

1. A method for producing an image of a body tissue, the method comprising: transforming a 3-D model of the body tissue comprising a first area, a second area, and a plurality of ablation lesions, into a flattened model by: expanding the second area in an outer direction to provide an expanded second area; reducing the distance between the first area and the expanded second area and providing the flattened model such that the expanded second area is more proximate to the first area than the second area; determining a path, on the 3-D model of the body tissue, between a first ablation lesion and a second ablation lesion of the plurality of ablation lesions; providing the first ablation lesion and the second ablation lesion on the flattened model such that the path between the first ablation lesion and the second ablation lesion on the flattened model is distorted based on expanding the second area and reducing the distance between the first area and the expanded second area; and providing an image of the flattened model.

2. The method of claim 1 , wherein expanding the second area in an outer direction comprises a circular expansion.

3. The method of claim 1 , wherein the flattened model comprises details of a body tissue.

4. The method of claim 1 , wherein the details are visually distinguishable from the body tissue.

5. The method of claim 1 , wherein the image of the flattened model comprises a width and length corresponding to spherical angle positions in the 3-D model.

6. The method of claim 1 , wherein the body tissue comprises an inner lumen surface of a body cavity.

7. The method of claim 1 , wherein at least one of the expanding the second area in an outer direction and the reducing the distance between the first area and the expanded second area introduces a discontinuity between two portions of the flattened model which correspond to two different and adjacent portions of the body tissue.

8. The method of claim 1 , wherein the 3-D model is updated with position measurements of the body tissue measured from a probe, as the probe is moved within a lumen defined by the body tissue.

9. The method of claim 1 , wherein a straight linear region, extending from one edge of the flattened model to another edge of the flattened model, comprises a distance that is distorted relative to the 3-D model by substantially the same amount through the linear region.

10. The method of claim 1 , wherein the path between the first ablation lesion and the second ablation lesion is distorted along a first plane based on expanding the second area.

11. The method of claim 1 , wherein the path between the first ablation lesion and the second ablation lesion is distorted along a second plane based on reducing the distance between the first area and the expanded second area.